Sheet metal forming machine



OC. 8, E935. H A. BERUNER ErAL 25,016,981

l SHEET METAL FORMING MACHINE Original Filed April 4, 1932, 6 Sheets-Sheet l Get.. 8, H935. H. A. BERLINER ET AL. gvm'ggl SHEET METAL FORMING MACHINE 6 Sheets-Sheet 2 Original Filed April 4, 1932 Hnry erlzegw, (/hrzfs''alzeoer @w MMX ct. 8, 1935. H. A. BERLINER Er AL 2,015,981

SHEET METAL FORMING MACHINE Original Filed April 4, 1952 6 Sheets-Sheet 3 C- 8 l935- ,H. A. BERLINER ET AL 2,916,981

SHEET METAL FOHMING MACHINE OIigi'DalvFiled April 4, 1932 6 Sheets-Sheet 4 Jj@ Z g2g/,Ja J3 J2 J 'Z I gag;

a5 l f '9 I H. A BERLINER ET AL SHEET METAL FORMING MACHINE original Filed April 4, 1932 e sneetsheet 5 7 a a a JmK if T/m. a 1T@ Mw HT w Ju. /f 7 U W d O 7 ,3 j, d 5- 7.x 4 96 ,ik 0 J l e j Zw n 1 2 e jm x 0 j j w j L oct. s; 193.5.k

IH. BERLINER ET AL.

SHEET METAL 'FORMING MACHINE original Filed'gpril 4, 1932 3 jllgzaa,

167 230 *fjzza 126 j 6 161 j 6 Sheets-Sheet 6 Patented Oct. `1935 2,016,981 SHEET METAL lFORMING: MACHINE Henry A. Berliner and Christian De Boer, Walliington, D. C., assignors to The Engineering and Research Corporation, a corporation o! District of Columbia Application April 4,1932, Serial No. 603,096

Renewed August 16, 1935 11 Chim.

Our invention relates to new and useful improvements in a machine for forming sheet metal l and more particularly to a machine of this character for forming anges on sheet metal and while primarily intended for use in aircraft construction it will be understood that it is not limited to this particular art.

The principal object of the present invention re'sides in the provision of a machine of the character described adapted to' eliminate the use of forms which are of excessive cost and to replace skilled hand labor which is slow and expensive.

Another object of the invention resides in the provision of a forming machine including a hammer or forming member for turning a flange on the edge of sheet metal while the metal is moved relative to the hammer or forming member by the hand of the operator or mechanically.

Still another object of the invention consists in the provision of a machine of the character described having a clamping member or what might be termed a hold down member synchronized with-the hammer whereby the material is clamped and held as the hammer or forming member turns the flange.

As a further object we provide in a machine of the character described means whereby the throw of the hammer orV forming member may be adjusted.

-As another object of the invention wey provide a machine of the' character described in which a flange may be formed on sheet metal without the use of any forms, a tool or member being provided for clamping or holding down the metal as the ange is formed, said tool or member being provided with an arm which acts as a gaugefor positioning the metal and also acting with an extension on the tool for forming the ange to the desired height or shape.

With the above and other objects in view. which-will appear as the description proceeds, our invention consists in the novel details of construction, and arrangement of parts, described in the following specification andillustrated in the accompanying drawings. and while we have illustrated and described the preferred embodiments ofthe invention, as they now appear to us, it will be understood that such changes may be made as will fall within the scope of the appended claims.

In the drawings: Fig. 1 is a longitudinal vertical section through the machiney with parts lshown in side elevation.

Fig. 2 is a rear view.

Fig. 3 is an enlarged detail showing a longi-l tudinal section through the hold down arm and associated members with parts shown in elevation.

Fig. 4 is a horizontal section on the line 4--4 of Fig. 3 looking in the direction of the arrows.

Fig. 5 is a fragmental'detail showing the hold 5 down tool in side elevation and onel step in forming the flange.

Fig. 6 is a perspective of one form of tool to be secured to the hammer or forming member.

Fig. 7 is a fragmental detail showing in section 10 a slightly different form of hold down tool and hammer tool.

Fig. 8 is a horizontal section on the line 8 8 of Fig. 'Hooking in the direction of the arrows.

Fig. 9 is a perspective showing a slightly diifer- 15 ent form of hammer tool from that disclosed in Fig. 6. y

Fig. 10 is a view similar to Fig. 7 showing a still further form of hold down tool and hammer tool.

Fig. 11 is a horizontal section on the line i I-.i i

of Fig. 10 looking in the direction of the arrows. Figs. 12 and 13 are respectively details of the form of hold down tool and hammer tool shown in Figs. 10 and 11. 25 Fig. 14 is a i'ragmental detail partly in section and partly in elevation vshowing a modied form of support for the metal being worked upon. Fig. 15 is a horizontal section on the line |5--I 5 of Fig. 14 looking in the direction of the ar- 30 rows.

Fig.- 16 is a fragmental sideeleva'tion showing` a support for a sheet of material on which an irregularly curved flange is to be formed.`

Fig. 17 is a top plan of the construction shown 35 in Fig. 16.'

Fig. 18 is a horizontal section on the line i8-,i8 of Fig. 16 looking in the ldirection of the ar- IOWS.

Fig. 19 is a vertical section on the line i9-i9 40 of Fig. 16 looking in the direction of the arrows.

Fig. 20 is a fragmental side elevation showing a mechanical feed for the material beingr operated upon. p

Fig. 21 -is a fragmental detail showing a front face view of the mechanical feeding member.-

Fig. 22 is a i'ragmental detail showing a slightly modied form of feed member.

Fig. 23 is a fragmentary plan showing'a modi- 50 ned formbf guide for feeding the material being operated upon to the anging mechanism; and

Fig. 24 is a section on the line 24-24 of Fig. 23 looking in the direction of the arrows.

one or the main objections to the use of sheet lthe shaft 20. An arm the shaft 25 and its upper end v which tools to be later described are provided and as an illustration of the vwork-which may be done with the machine w'e might refer to the formation of wing ribs, control surfaced ribs, longitudinals, frames and bulk heads for monocoque'fuselages or pontoons, tank ends and bulk headsor the like. Of course, our machine is not limited for forming the mentioned articles but may be used wherever it is desired to turn up 'a nange from ysheet metal. l 4

'in the drawings I indicates a pedestal or standard carryingr at its top the plate or platform 2 provided with the opening 3 for a purpose which will be later apparent. j

Secured to the front face of the pedestal l, by means of the bolts 4 or other suitable fastenings; is a bracket 5 to which a foot treadle 5 is pivotally connected at 1. This foottreadle-has the upwardly extending lug 8 and the downwardly projecting lug 9 each of which is provided with a threaded opening in which operates the adjusting screws I0 and I i,

the inner end of the adjusting screw l0 normally engaging the plate l2 of the pedestal for limiting upward movement of the treadle whereas the end of the screw Il, engaging the plate I2, will limit the downwardmovement of the treadle when the treadle is depressed; The foot treadle is normally held in its-raised position by means of the coiled spring I5, the upper Aend of the coiled spring being secured to the pedestal at i4 while the lower end is formed with a hook portion to be received in the perforation I5 formed in the treadle. This coiled spring I3 normally holdsthe treadle in its raised position with the inner end of the adjusting screw l0 engaging the face of the platen. Also secured to the treadle 5, by means of the transversely extending pin I5, is theflower end of a rodor bar -i1, the upper end of therod-,or bar being conn'ected at i5 to the arm I9 secured to 2i is also connected-to is connected at 22 to alink-22 forapurpo whichwillbelater brought out. ,f An electric motor 24 is secured to the base 25 of the pedestal and secured tothe end ofthe motor shaft 25 is a gear or pinion 21 which meshes with the relatively larger gear 25 carried by the inner end of the horizontal shaft 25 supported in thebearingsll andtl. securedtoonefaceof the gear 25 is a cam disc or plate 52. Current is supplied to the motor 24 inthe usual manner by alead'in conductor wire. A f l A `The iowerend of a bar or link 25 is pivotally connected to the outer face of the cam disccr platen, eccentrically at 54, and the upper end the top of the `'lli of the bar or link is pivotally connected to the dependinglug 55 formed adjacent one end of the y arcuate-shaped guide or arm 55. The guide or arm ispivotally connected at 51'to the depending` portion 55 of a member 25 secured to pedestal, as shown Imore particulardrawings. The arcuate-shaped provided in its inner face with lyinFigJofthe guideorarmis ed to be secured to the arcuate-shaped member for the material Athecasewitl'ltheh'ammer tocooperate the recess 59 in which is slidably mounted a block 40 to which is pivotally connected at 4I one end of a link 42. The inner end of the link 23 is pivotally connected at 43 to the link 42 intermediate its ends as shown ,more particularly in il Fig. 1 of the drawings. The upper end of the link 42 is pivotally connected at 44 with the arcuate-shaped member 45 which is mounted inthev guide-ways 45 for oscillating or'pivotal movement. Various forms of hammer tools are adapt- 45 depending on the type of flange adapted to be formed. In Fig. 4 of the drawings I have illustrated a casting 41 adapted to be secured to the face of the arcuate-shaped member by means ofthe screws 48 or other suitable fastenings and a hammer tool 45 of the shape shown more particularly in Fig. 6 of the drawings is secured to ythe casting 41 by means of the screws 50 or other suitable fastenings. This particular form of 20 hammer tool is adapted for forming an internal flange in the manner disclosed in Figs. 3 and 4 of the drawings. Pivotally connected at 5|, between the upstanding portions 52 ofthe member 38', is a ciampi-.5 or hold downarm having the rearwardly directed lug or projection 54 provided with a threaded opening for a purpose to be later described. Slidably mounted in the arm 53 is a tool or hold down foot carrying member 55 adjustable by 50 means of the screw 56. The screw has thev irregularlyv` shaped end portion 51 extending into the enlarged opening 58 of the member 55, this irregularly shaped `portion A51 being engaged by a suitable tool or wrench for operating the screw.

The member 55 has the depending portion or lug 59 with the reduced extension 80 to which a hold down tool or foot 5I may be secured by means of the screw 52 or other suitable fastening. The tool or foot 5i includes the depending part 53 40 and the arcuate-shaped arm 64, the depending part 52 -being of -the desired shape to cooperate with the hammer plate or tool to form the desired shaped flange. As shown the lower end of the arcuate-shaped arm 54 extends -below the 45 lower end of the extension 53 tobe engaged by the edge of the strip of' material 65 before the flange is turned and the arcuate-shaped arm acts asa guide for the flange as the same is being turned.` ',In other words the material is placed 50 beneath the extension 55, as shown in Figs. 3 and 5 of the-drawings, and the end of the material ,will engage the lower end of the arcuate-shaped arm 54. This regulates the'amount to be turned 'upwardly to form the flange and arcuatefshaped arm'is such as to ,forma guide forming the flange as itis turned upwardly as shown inFlg. 5 of the drawings. The hold down tools or feet are interchangeable as is forming different shaped anges `or flanges of different heights. A screw'55 is received and operates in the threaded opening of the lug or projection 54 and this screw is provided at its upper end.' with a hand grip 51 and at its lower u.

end withlan e'xteriorlythreaded enlargement-55 -a socket for the rounded end 1l of the'rod 1l. The rounded end 15, with the socket forms a ball and socket Joint for connecting the rod'1l to the vhold down arm 55. A-lock nut is shown at 12.

Connected tothe lower end of the rod 1I is a roller 15 which normally engages the edge of thecamplateordis'c22,assl1ownmoreparticulmyinrm. fausser-meanings. Pivot-.Il

thecurve of thef plates or tools for with `the -nut member 55 to provideA v ally connected at 14, to the lower end of the rod 1|, is a lever 15 having the hand grip 18 and provided on its lower edge with the notches or recesses 11 and 18. A transversely extending rod or pin 19 is normally received in the notch or recess 11 and the lever is drawn downwardly by means of the coiled spring 80. When it is desired to quickly raise the hold down arm to release the tool or foot from the material it is only necessaryv to lift up on the outer end of the lever 15, by grasping the hand hold 18, and releasing ,the

. rod or pin 19 from the notch or recess 11; 'I'he Vso `ses

coiled spring will quickly draw the lower end 1 of the lrod 1| towards the face of the pedestal or from the surface of, the cam disc 32 and this movement will also draw the rod 1| downwardly to raise the forward end of the hold down arm to release the tool or foot from the material. When the lever 15 is thus released the pin or rod 18 will be received'within the notch or recess 18. When operation is to-be resumed the lever 15 will be manipulated to force the rod 1| to its original position with the roller 13 in engagement with the edge of the cam disc or plate 32. d

For holding the treadle 8 in its desired position we provide the pawl member 8|, pivotally connected to the treadle by the pivotal pin I6 which treadle the foot engaging portion 88 is engaged to release the end of the pawl member from the teeth of the plate 82 and the treadle will be raised by means of the coiled spring I8.

In Figs. '7 and8 of the drawings we have illustrated a hammer plate or tool and cooperating hold down tool or foot of a shape to, form an external ange on the sheet of material, the ham- -mer tool or plate being` shown at 84 and the hold down foot or 4tool at 85. The construction of these parts are the same as that previously deu scribed, the hold down foot 85 including the extension 88 having the curved face 81 and the arcuate-shaped arm 88. The outer face o f the hammer tool or plate is of the shape shown to cooperate with the curvature 81 of the extension 88 to make the desired ilange. The specic form of the hammer plate or tool 84 is shown more particularly in Fig. 9 of the drawings.

In Figs. 10 to 13 inclusive we have illustrated a hammer plate or tool and a hold down foot or tool of a shape to make what maybe termed a double ange. In this form of the invention thehammer plate 88 is provided with the outwardly extending flange or lip 88 on one face and the hold down tool or foot 80 has the depending portion or exv tension 9| and the arcuate-shaped arm 82, the depending portion 8| formedwith a recess 88 to cooperating .with the lip or ange 88 to provide the inset portion 84 on the up-turned flange. l

In Figs. 14 and 15 of the drawings we have illustrated a slightly dierent form of support for the material being` flanged. 'In the construction shown more particularly in Figs. l and- 2 of the drawings the work is normally supported on the table or platform 2 but this table or platform could not be used for forming anexternal ilange on a sheet of material where an internal ilange has already been formed. InFigs. 14 and 15 of the drawings we have illustrated the sheet of material as having been formed with the internal flange 96 and' when the external flange 81 is to be formed the material with the depending flange 96 previously formed must be sup 6 ported. In this form of the invention we re.

move the table or platform `2 and substitute therefor the plate or bar 88 which supports the edge of the material as shown more particularly in Figs. 14 and 15. This plate or bar 88 does'not 10 interfere with the depending ilange 80 and the plate or bar may be secured to the pedestal by means of the screws 88 or other suitable fastenings.

At times it will be desirableto turn up flanges 15 of an irregular curve and in order that this may be done we provide the clamp or material holder shown more particularly in Figs. 16, 1'I, 18,and 19 of the drawings and have shown in Fig. 17 an elliptically-shaped flange as beingformed. 'I'he 20 clamp or material support consists of the bracket |00 secured in position on thev pedestal by means of the screws |0| or other suitable fastenings and pivotally connected to the bracket at |02 is the arm |08 having at its outery end the 25 horizontal portion |04 provided with the longitudinally extending slot |05. Secured -to the horizontal portion |04, by means of the nut |08; is a guide `member denoted generally at |01 having a threaded extension |08 extending through 30 the `opening |05 to receive the nut |08. The guide member |01 is in the form of a cross having the recessed arms |08, |10, and ||2. VBlocks ||8 and ||4 are slidably mounted in the arms or the guide and the block lla is adapted -to slide 35 from the arm to the arm |08 whereas the block ||4 may be slid from the 'arm.||0 to the arm 2. The sheet of material I|5 of elliptical. or oval'shape is adapted to be secured to the blocks H8 and ||4 by means of the screws ||8'4 0 which lengage'in threaded openings formed in sleeves ||1 rotatably mounted in the blocks 3 andi I4. 'Ihe height of theup-turned flange ||8 is governed by the position or adjustments of thev blocks ||8 and ||4 in the arms of the guide be- 45 fore being secured to the sheet of material. When the material is connected to the blocks in the guide then by turning the same .the ilange will be turned upwardly on an irregularcurve.

As the material is turned it will bevunderstood 50 `that the blocks ||8 `and ||4 are slid in the directions shown by the arrows in Fig. 18 of the drawings. The arm |08 of the holder'or clamp may be swung on its pivot |02 to a raised position. We have shown a coiled spring lat H8 con- 5.5 l nected at |20 to the arm |03 and at |2|rto the bracket Inn. when in the position shown in Fig. 16 the coiled `spring tends to hold the arm in lowered position but whenthe arm is raised the' coiled spring willbe positioned on the opposite 60 side of the pivot |02 and thereby tend to hold the arm in its raised position. It will be Aunderstood that the clamp or holder just described acts as an ellipsograph" or trammel or in otherv v words feeds the sheet of material of elliptical or 65 loval shape in proper position relative to the flange turning hammer to form the proper flange.

`-When this holder is used it is not necessary that the sheet of material be formed to exact dimensions for a raw edge'might be turned, the height 70' or the flange not depending on the 'formation of the hold down tool or foot as is the case when the clamp. or holder is not used. In certain work it is not necessary that the flange be of uniform height throughout. 15

.shaped forwardly. In Fig.

At times it' will be desirable to feed the sheet of material mechanically instead of by hand and for this purpose we have provided theconstruction disclosed more particularly in Figs. 2|)A and 21 of the drawings. Inthis construction s rod |22 is pivotally connected at |23 to the oscillatory arcuate-shaped member 49, the opposite end of the rod being threaded as shown at |24 to receive the nut |29. The rod |22 is slidable through a lug or projection |23 of an arm |21 carried by a sleeve |29 mounted on a rod |29 supported by the bracket |39 securedK to the upwardly extending portion 32, by means of the screws |3| or other suitable fastenings. Securedto an end of the rod |29 is an arm |32 having pivotally connected, adjacent. ts lower end, a .pawl |33,

provided on its lower edge with the serrations r |34. A spring |39 normally tends to hold the pawl |33 in its lowermost position in engagement with the sheet of material |33. A coiled spring |31 surrounds the rod |29, as shown more particularly in Fig. of the drawings', and normally holds the arm |21 in raised position. In Fig. 20 of the drawings wehave shown the arcuatel member carrying the hammer tool or plate as raised and as this member 4l is lowered the nut will engage the lug or projection |26 .and swing the sleeve |29 with the rod |29 to in |43, this rubber or other material forming a frictional engagement with being' operated upon to manner previously described.

' -At times it is necessary to operate on materialj not having a iinished edge or in other words material with a rough'edge. It is also desirable,

. drawings.

or support |4| is provided with the T-slot |42 at times, to turn up a flange of irregular heights. In order that this may bedone we provide the construction disclosed inFigs. 23 and 24 of the In this form of the invention the table in which operates a plate or strip |43. The sheet of material |44 is clamped between the strip or plate |43 and an upper strip' or plate |43, the two strips being connected by the wing nuts |49 received on the threaded extensions |41 carried by slidable in the Tslot |42 and when slid with the the plate or strip |43. The'strip or plate |43 is sheet of material |44 aviiange willbe turned-up- I hold down arm.

wardly parallel with the longitudinaledge of the strip or plate |49. In this'form of the invention it is not necessary to use the hold down tool or' foot used -in the other forms of the invention for the sheet ofmaterial, |44 being'positioned-and held as described permits the flange to be turned upwardly, as previously stated, parallel with the iimgmmnwaare of .the strip' In.

We wish to lay particular'stress on the advanesofthenoidcuwnwoiorfootcarnedbytne character described used it is not necessary to use any forms as is'the casein the copending --Simmons application Serial 110.385.081.' Y As has been previously stated, the sheet of material to be nanged is' positioned on the table, or platform 2and the edge` thereof will be engaged with the shaped armof the hold down tool 'or thesheet of material s feed the same in the4 l lever 1l.

when a tool `or foot of thev foot. In Fig. 3 of the drawings the arcuateshaped arm is shown at 64. When the hammer is operated the hammer plate or tool shown at 49 in Fig. 6 engages the material and turns a flange upwardly,

is turned to itsuppermost position it will be engaged between the inner face of the depending portion 93 of the tool or foot and the hammer plate or tool, as shown more particularly in Fig. 3 l0 of the drawings. It is preferable that the flange vnot be turned entirely upward at one stroke but preferably it is turned up gradually as shown more particularly in Fig. 5, this being accomplished by operating the treadle 6 `which regulates l5 'the position of the block 40 in the arcuate-shaped guide 36. The point at which the block is moved relative to the arm or guide 36 regulates the throw of the hammer plate or tool carrier. The height of the flange to be turned is determined 20 by the curve of the arcuate-'shaped arm of the hold down foot or tool as well as the position at which this arm is set relative to the vertical extension of the tool or foot.

With the sheet of material positioned with its 25 edge in engagement with the arcuate-shaped arm of the hold down tool or foot the motor 24 will be started and through means of the pinion 21V will operate the gear 28 and cam disc 32 associated therewith. This movement of the cam disc 80 32 will cause the hold down arm 53 and the arcuate-shaped hammer member 45 to be operated simultaneously through means of the bar 3 3 and rod 1|. As the hammer plate or tool engages the sheet of material to turn the flange the hold dowh arm will be positioned so that the hold down tool or foot will be clamping the sheet of materialen the table or platform 2. Then when the hammer tool carrying member is lowered the hold down tool or foot will be raised to permit movement of the sheetnof material. As previously stated, the throw of the hammer tool or plate carrying member is regulated by the position of the block 40 in the guide or arm 36, this position being determined by the position 4s of the treadle 3 which operates the block through means of the bar I1, arms i9 and :2| and links 23 and 42.- The treadle 6 may be held to provide 1 a predetermined throw of the hammer tool carrying member by means of the pawl member 8| 50 engaging the teeth of the plate 92 and may be released by engaging the foot portion '83 when desired. As also previously stated, to quickly release the hold down tool or foot from the sheet of material being operated upon the roher 13 55' carried by the rod v1| may be released from the edge of the cam disc 32 by manipulating the 'Having fully described our invention 4what', we claim as new and desire to secure by Letters Patent is:

l. A machine of the character described in'- cluding a support for the material to be operated upon, a member engageable with the material for turning a ilange thereon, and means for clampmik ing the material onto the support as the ilange is being turned and guiding. the flange, said means including an arm pivotally mounted, an

ln depending from the arm, and a member detachably connected to the extension.

2. A machine of the character described including ,lasupport for the material to be oper- 'ated upon, a member engageable with the material for turning a angev thereof, and means the support and for lthe material on the edge of the. flange at all times 5 engaging the curve of the arm. When the ange guiding the ange as it is turned, said means including a pivotally mounted arm, a member adjustable `relative to the arm, and a tool detachably connected tothe adjustablev member,

sai-d tool having a vertically extending portionV engageable with the material and an arm forming the guide for the flange as it is turned.

3. A machine of the character described including a support.l for the material to be operated upon,'a member engageable with the material for turninga flange thereon, and means for clamping the material on the support and guiding the rial for turning a flange thereon, an adjustable treadle operablexto regulate the throw of the iiange turning member, and means for locking the treadle in its different positions of adjustment.

5. A machine of`the character. described including a support for the material to beoperated upon, a member engageable with the material for turning a ange thereon, a member engageable with the material for clamping the same upon the support as the flange is being turned, a cam, a member engageable with the cam for operating the clamping member, and

` means for disengaging the cam engaging mem'- ber from the cam to release the clamping member from the material.

n6. A machine of the character described including a support for the material to be operated upon, a. member engageable with the material for turning a flange thereon, and means independent of the support and .directly engageable with the material for feeding the material relative tothe flange turning member, said lfeeding means being operated by the ange turning member. f. e

7. A machine of the character described lincluding a support for the material to be operated upon, a member engageable with the material for turning a ange thereon, and means for feeding the material relative to the iiange -turn- "ing member,- saidfe'eding means including strips between which the material is clamped, the ange being turned parallel to a longitudinal edge of' the strips.

8. A machine of the character described including a support for the material .to be loper- 5 ated upon, amember adapted to be engaged with the material for turning a ange thereon, and a clamping member adapted to be engaged with the material to clamp the same upon the support, said clamping member including a potion 10 adapted to be initially engaged by the edge of the material and forming a gauge to determine the height of theange to be turnedi and a guide for the edge of the ange as the flange is turned.

9. A machine of the character described inl5 cluding a support for; the material to be operated upon, a. member adapted to be Vengaged with the material for turninga ange thereon, and a clamping member adapted to be engaged with vthe material to clamp the same upon the sup- 2o port, said clamping member including an arcuate-shaped arm adapted to be initially engaged by the edge of the material and forming a gauge to determine the lheight of the iiange to be turned and a guide for the edge of the flange 25 as it is turned. f- 10. A machine of the character described including a support for the material to be operated upon, a member adapted to be engaged with the material for turning a ange thereon, and a 'movable clamping member adapted to be engaged with the material to clamp the same uponl the support, said clamping member including an arcuate portion positioned relative to the support so that an edge of the material placed upon the support in flat 4condition -will engage the same to determine the height of the flange to be turned and follow the arc as the flange is turned. g 11. A machine oi' the character described including a support for the? material to be oper- 40 ated upon, a member adapted tolbe engaged with the material for turning a ange thereon, and a readily removable and' interchangeable pivotally mounted clamping member adapted to be engaged with the material lto clamp the same 45 up'on the support, said clamping member including a portion positioned relative to the support so that an edge of the material placed upon the support in flatcondition will engage .the same to determine the height of the ange to' be 50 turned.

f' l HENRY A. BERLINER.. 

